A EEA^ISION OF THE WEST NORTH AMERICAN 

 SPECIES OF CALLOPHYLLIS 



BY 

 WILLIAM ALBERT SETCHELL 



The North American species of CallophyUis have never been 

 revised, or even critically studied. Some years ago Dr. Olive Swezy, 

 at the advice of the writer, made a critical study of our West Coast 

 forms and the writer himself has since extended these observations. 

 The greater number of the species referred to, or possibly referrable 

 to, this genus have been examined and the following arrangement has 

 been adopted. 



This account is preliminary to a full discussion at some later date. 



Key to the Species of Callophyllis of the Pacific Coast op North America 



1. Cystocarps on terminal segments only 2 



1. Cystocarps marginal (or on lateral lobes) only 9 



2. Congested at the very tips, projecting C. acrocarpa 



2. Subterminal, on ultimate laciniae 3 



3. Immersed - C. flabelliilata 



3. Projecting -- C. filicina 



4. On tips of lateral lobes -- C. odonthalioides 



4. Along the margins 5 



5. Mostly projecting from the margins 6 



5. Just within the margins 7 



6. Frond over 400/x thick C. crassifolia 



6. Frond under 400/^ thick C. marginifructa 



7. Margins of the frond finely crisped 8 



7. Margins plane and entire C. Gardner! 



8. Cystocarps scattered C. stenophylla 



8. Cystocarps crowded C. Thompsonii 



9. Margins crisped, laciniate, or proliferous 10 



9. Margins nearly or completely entire 11 



10. Margins crisped C. crenulata 



10. Margins crowded with narrow, slender, compound laciniae 



C. plumosa 



10. Margins with regular, broad, stalked pinnules C. pinnata 



11. Frond dichotomous below, pinnate above 12 



11. Frond dichotomous throughout 13 



12. Fronds under 400fi thick, cystocarps small C. violacea 



12. Fronds over 600/^ thick, cystocarps large C. megalocarpa 



